Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 121 (ENGINE CONTROLS - THEORY & OPERATION - EEC-IV 2.0L)COMPUTERIZED ENGINE CONTROLSINPUT DEVICESINTAKE AIR TEMPERATURE (IAT) SENSOR
1991 Mercury Tracer Base, 4D Sedan, Automatic
Intake Air Temperature (IAT) Sensor
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Intake Air Temperature (IAT) Sensor
WARNING: This page is about a different car, the 1994 Ford Probe. However, it is still accessible from the selected car via links, so may be relevant.
IAT sensor inputs air temperature to the PCM. The IAT sensor changes resistance in response to air temperature. The ECT sensor resistance decreases as air temperature increases.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.